<?php

/**
 * mForge Framework
 *
 * LICENSE:
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * The license is bundled with this package in the file LICENSE.txt.
 * You may also obtain a copy of the License at this URL:
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @copyright  Copyright (c) 2011, Jonathan Hedrén
 * @author     Jonathan Hedrén <jonathan.hedren@gmail.com>
 * @license    http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
 */

namespace mForge\Modules\Cache;

use mForge\IModule;
use mForge\Application;
use mForge\Request;
use mForge\Response;
use mForge\ViewResult;

require_once 'lib/ICacheHandler.php';

class Module implements IModule
{
    /**
     *
     * @var Application
     */
    private $app;

    /**
     *
     * @var array
     */
    private $cacheHandlers = array();

    /**
     *
     * @var array
     */
    private $moduleConfig;

    /**
     *
     * @param Request $request
     * @param Response $response
     * @param Application $app
     * @param array $moduleConfig 
     */
    public function init(Request $request, Response $response, Application $app, array $moduleConfig)
    {
        $this->app = $app;
        $this->moduleConfig = $moduleConfig;
    }

    public function getCacheHandler($instance = 'default')
    {
        if (!isset($this->cacheHandlers[$instance])) {

            if (!isset($this->moduleConfig['instances'][$instance])) {
                throw new \Exception("Missing configuration for the '$instance' instance.");
            }

            $instanceConfig = $this->moduleConfig['instances'][$instance];

            $handler = __NAMESPACE__ . '\\' . $instanceConfig['handler'];

            if (!class_exists($handler)) {
                require_once 'lib/' . $instanceConfig['handler'] . '.php';
            }

            if ($instanceConfig['handler'] == 'FileCacheHandler') {
                $this->cacheHandlers[$instance] = new $handler(
                    $this->app,
                    $instanceConfig['options']
                );
            } else {
                $this->cacheHandlers[$instance] = new $handler($instanceConfig['options']);
            }
        }
        return $this->cacheHandlers[$instance];
    }
}